A fuel cell is a kind of battery. It makes electricity. One side of the cell is filled with hydrogen. The other is filled with oxygen that comes from the air. The hydrogen separates into electrons and protons. The electrons supply the power for the motor. The protons mix with the oxygen to make water. The water passes out of the cell.

Choose the clue words that indicate chronological order.

Choose the clue words that indicate compare and contrast

Choose the clue words that indicate problem and solution

No one knows exactly what causes tornados, but some scientists believe that when warm air meets cold air, a tornado may form. The reason for this is that the warm air is lighter than the cold air, so it rises up fast and meets different winds moving different directions. Under the right conditions, this can cause a tornado. Though there is still much mystery surrounding tornados, many people believe that when warm moist air meets cool dry air, tornados can result.

The Northern Inuit Dog is a large-sized, wolflike dog. They are a cross between the German Shepherd, the Alaskan Malamute, and the Siberian Husky. Although they bear a strong resemblance to wolves, Northern Inuits generally make good pets because they are intelligent, good-natured, and good with children. These dogs are also quite playful and need a great deal of exercise.

An opinion is a statement that holds an element of belief; it tells how someone feels.

A commonplace assertion is---

All statements below are factual claims except--

In the sentence below, what does the word eliminating mean? "Second, you are eliminating the transportation costs it takes to ship produce to you.

Which statement best expresses an opinion?

"If your lunch period is later in the day, you might consider adding a freezer pack (or "chiller) to your lunch bag to keep perishable ingredients fresh." In the sentence above, the word perishable refers to ingredients that-

Scientists are the wisest people on the planet

The Underground Railroad was a secret organization which helped slaves escape to freedom. Many slaves were able to escape because of the conductors and station masters. The northern states were free states and slaves were free once they arrived in the north. Secret codes and signals were used to identify the conductors and station masters.

Judy Glen's amazing Wrinkle Remover cream will make you look younger in thirty days or less. This remarkable cream has special ingredients to make your wrinkles disappear. The cost for a thirty day supply is $ 25.99. Send your check to P.O.Box 00002, Shelton, CA 74836

The Cassowary is just a bird, some may think. To the casual observer, some of its traits are indeed unremarkable. For example, cassowaries distribute seeds across the jungle floor. Also, the female lays three to eight eggs. And yet, Cassowaries are also deadly. Watch a Cassowary swallow a banana whole and you will glimpse its voracious appetite. What is the author's purpose

The long, white halls of the Children’s Hospital were very similar to the ones in South Carolina. Back when I was diagnosed, the bland walls seemed sterile and sad. I turned into Deena’s room and was surprised to see enormous flowers painted in bright reds, blues and yellows on her walls. A brand new TV connected to a DVD player- and loaded down with games was in the corner. What is the author's purpose?

As Principal Pratt dragged Darius toward the door, he passed by Tommy. Tommy raised his head from the table to reveal weary eyes. He slumped over just a little. All of a sudden, clutching his stomach, Tommy staggered and cut in front of Principal Pratt. His foot outstretched, Tommy looked as if he might trip Darius. Quickly, Principal Pratt grabbed the sleeve’s edge at Tommy’s elbow. As he did, Tommy teetered. Almost immediately, Tommy stood upright and vomited on Darius’s shoes. What is the author's purpose?

It is important to break some rules. Think back in history to Rosa Parks and Dr. Martin Luther King, Jr. They realized the rules of the country were unjust. It was necessary for them to break rules in order to bring about change. Parks and King were not your typical delinquents. But they were rule-breakers. In their cases, breaking rules was not only important, it was heroic. Don’t dismiss the idea of breaking rules. Instead, consider each rule carefully.

When I went upstairs I couldn't help but think about Christy. It was strange that she knew where I lived. It was totally strange that she wanted my chemistry notes. Who was this girl who was outfitted in a flapper dress and knee boots? What connection did she have to our school- and more specifically- me?

When I stepped out into the bright sunlight from the darkness of the movie house, I had only two things on my mind: Paul Newman and a ride home. I was wishing I looked like Paul Newman---he looks tough and I don't--- but I guess my own looks aren't so bad. I have light-brown, almost-red hair and greenish-gray eyes. I wish they were more gray, because I hate most guys that have green eyes, but I have to be content with what I have.My hair is longer than a lot of boys wear theirs,squared off in back and long at the front and sides, but I am a greaser and most of my neighborhood rarely bothers to get a haircut.Besides, I look better with long hair. What is the main idea?

Native Americans dried strips of meat, pounded it into a paste, and then mixed it with fat. Sometimes they added berries and sugar. Then they pressed it into small cakes. They called these cakes pemmican. Pemmican didn't spoil, and it provided lots of energy for people traveling or going hunting. Today explorers still carry and eat this food. What is the passage mostly about?

Sometime in December of 1891, Dr. James Naismith was teaching gym at the YMCA College in Springfield, Massachusetts. It was raining, and Dr. Naismith was trying to keep his students active. He wanted them playing a rough game that would keep them moving. He didn't like a few ideas that were too rough. Then Naismith had his breakthrough. He wrote out the rules for a game with peach baskets fixed to ten-foot elevated tracks. Naismith's students played against one another, passing the ball around and shooting it into the peach baskets. Dribbling wasn't a part of the original game. Also it took a while to realize that the game would run more smoothly if the bottoms of the baskets were removed. But this game grew to be one of the most popular sports in America today. Can you guess which one?

Yellowstone National Park is mainly located in Wyoming, although three percent is located in the state of Montana. The Continental Divide of North America runs diagonally through the southwestern part of the park. The park sits on the Yellowstone Plateau, which is an average elevation of 8,000 feet above sea level. This plateau is bounded on nearly all sides by mountain ranges. There are 290 waterfalls that are at least fifteen feet in the park, the highest being the Lower Falls of the Yellowstone River, which falls 308 feet.

It is estimated that over twenty million pounds of candy corn are sold in the US each year. Brach's, the top manufacturer, sells enough candy corn to circle the earth 4.25 times if each piece were laid end to end. That's a lot of candy corn, but that's nothing compared to the production of Tootsie Rolls. Over 64 million Tootsie Rolls are produced every day! But even Tootsie Rolls have got nothing on the candy industry's staple product: chocolate. Confectioners manufacture over twenty billion pounds of chocolate in the United States each year. Now that's a mouthful!